It is obtained by condensation of phenol and acetone in an acidic medium. When sulfuric acid is used as catalyst, the acid concentration is 72.5-76.3, and the reaction temperature is about 40ºC. The reaction is carried out in a stirred kettle, which can be produced by intermittent method, or a continuous production device can be arranged. The product was neutralized and separated to obtain crude bisphenol A, and then refined by xylene water extraction. Sulfuric acid method requires less equipment, simple process, but poor product quality, high raw material consumption, "three wastes" more, only suitable for small and medium-sized intermittent production. In order to obtain good quality polymerized bisphenol A, the commonly used industrial method is hydrogen chloride gas as catalyst. Acetone was mixed with phenol, and dried hydrogen chloride was used as catalyst for the reaction under normal pressure. The reaction was carried out at 50-60ºC for 8-9h, and the concentration of hydrogen chloride in the gas phase was maintained above 96. In addition to bisphenol A, the reaction also produces some isomers, trihydroxyl or monohydroxyl byproducts. These small amounts of impurities do not affect the use in manufacturing epoxy resins. But when it is used to make polycarbonate, it must be refined. Hooke process is distillation under pressure and extraction crystallization to refine bisphenol A, so that the product cost is reduced. Raw material consumption quota: phenol 940kg/t, acetone 320kg/t, sulfuric acid (98) 500kg/t.
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